Answer:
C :as intensity increases, time should decrease
Answer:
Our digestive system is designed with a.......... Bidirectional tube with separate compartments and two openings.
Explanation:
I think the correct answer would be “look at it”
Answer:
True
Explanation:
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries don't require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.
